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4. Inventories, net (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Components of inventory
   

March 31,

2021

   

December 31,

2020

 
Finished goods   $ 2,350     $ 1,975  
Work in process     3,441       3,288  
Raw materials     4,720       4,178  
    $ 10,511     $ 9,441